High-toughness gas shielded arc welding wire for ultra-low heat input automatic welding, and welding method thereof

A gas shielded welding wire, automatic welding technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of weld metal embrittlement, impact energy and CTOD fracture toughness decline, can not meet and other problems, to achieve low temperature impact toughness improvement Effect

Inactive Publication Date: 2020-09-04
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, if the above-mentioned composition system welding wire is applied to the ultra-low heat input gas-shielded welding of no more than 0.25kJ/mm required by the aforementioned overseas pipeline steel pipe users, it will be the same as the commonly used AWS A 5.18ER70S-G gas-shielded solid welding wire. Stripped martensite and M-

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  • High-toughness gas shielded arc welding wire for ultra-low heat input automatic welding, and welding method thereof
  • High-toughness gas shielded arc welding wire for ultra-low heat input automatic welding, and welding method thereof

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with embodiment.

[0051] Refer to Table 1 for the composition of the gas-shielded solid welding wire of the present invention. Table 1 shows the chemical composition ratio of 5 different gas-shielded welding wires suitable for ultra-low heat input welding.

[0052] The API 5L X70M pipeline steel pipe with a wall thickness of 23mm is selected, and the gas-shielded solid welding wire of the present invention is used for automatic welding with an ultra-low heat input of no more than 0.25kJ / mm. The steel pipe adopts compound V-groove. The bevel angle is 5±2°, and the depth is 17mm. The down bevel angle is 30°±2°, and the depth is 5mm. The blunt edge of the groove is 1±0.5mm. The back of the root weld is formed using a copper backing to aid in the welding process. Use 80% Ar+20% CO 2 Mixed gas protection. Before welding, it is necessary to grind and clean the welding groove and the 20mm range on both...

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Abstract

The invention provides a high-toughness gas shielded arc welding wire for automatic welding of ultra-low heat input, and a welding method thereof. The gas shielded arc welding wire comprises the chemical components by mass: 0.04%-0.09% of C, 0.3%-1.0% of Si, 0.5%-1.2% of Mn, less than 0.02% of P, less than 0.01% of S, 0.15%-0.5% of Ti, 0.03%-0.08% of V, 0.02%-0.06% of Nb, 0.9%-1.8% of Ni, 0.3%-0.9% of Cu, and the balance Fe and inevitable purities, and simultaneously meets the requirements of Si/14+Mn/27.5+Ti/24=0.06-0.12; and Ti/192+V/51+Nb/93=(0.5-1.0)C/12. The high-toughness gas shielded arc welding wire stated in the invention is applicable for automatic welding of ultra-low heat input of no more than 0.25kJ/mm.

Description

technical field [0001] The invention relates to a gas shielded welding wire, in particular to a high-toughness gas shielded welding wire for automatic welding with ultra-low heat input and a welding method thereof, which is suitable for automatic welding with an ultra-low heat input of no more than 0.25kJ / mm. Background technique [0002] Gas-shielded automatic welding with molten electrode has high efficiency, stable and reliable welding quality, easy operation and low overall cost, and has been widely used in various industrial fields. In the construction of long-distance oil and natural gas pipelines, girth welding is a key link in construction, and the advantages of gas metal shielded welding are more obvious, and it has become the mainstream method of pipeline construction welding on site. Since the weld metal belongs to the typical non-equilibrium rapid solidification columnar grain structure, the performance cannot be improved by rolling deformation like the base meta...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/38B23K9/16
CPCB23K9/16B23K35/0261B23K35/3066B23K35/3073B23K35/383
Inventor 刘硕曹能钱伟方
Owner BAOSHAN IRON & STEEL CO LTD
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